Edmund Muskie, in full Edmund Sixtus Muskie (born March 28, 1914, Rumford, Maine, U.S.—died March 26, 1996, Washington, D.C.), American Democratic politician who served as governor of Maine (1955–59), U.S. senator (1959–80), and secretary of state (1980–81) in the cabinet of Pres. Jimmy Carter.

After graduating cum laude from Bates College in 1936 and from Cornell Law School in 1939, Muskie began practicing law in Waterville, Maine. He served in the navy during World War II and then returned to his practice in Waterville. His political career began in the state House of Representatives (1947–51), and in 1954 he became the first Democrat in 20 years to be elected Maine’s governor. In that post Muskie stressed environmental concerns, supporting clean air and water legislation. In 1958 he was elected to the U.S. Senate, and his continued support of environmental issues while a congressman earned him the nickname “Mr. Clean.” Laws regarding water quality, regional clean air standards, and a model cities program were among his successes.

Muskie first gained nationwide public recognition when Hubert H. Humphrey selected him as his running mate in the 1968 presidential election campaign. In a close contest the Democrats lost to the Republican ticket of Richard Nixon and Spiro Agnew. Muskie campaigned for the Democratic presidential nomination in 1972, but a disastrous public appearance in New Hampshire scuttled his chances in the race. While angrily denouncing attacks by the Manchester Union Leader on his wife, he seemed to some to be crying. Although he said that what appeared to be tears on his face was really melting snow, Muskie could not shake an image of weakness. In 1980 he left the Senate to serve as secretary of state during the last months of Jimmy Carter’s administration. After Carter’s presidency ended in 1981, Muskie returned to law. From December 1986 to February 1987 he served on the Tower Commission, a fact-finding committee appointed by Pres. Ronald Reagan to investigate potential wrongdoing by the White House in the Iran-Contra Affair. He was a senior partner in the Washington, D.C., office of a New York law firm at the time of his death. His honours include the Presidential Medal of Freedom (1981).

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